One size does not fit all and I wouldn't take much stock in any advice stating that housing assistance tenants are better or worse as a whole. 

I have cash reserves and money in retirement accounts, but I don’t want to dip too deeply into my reserves.

These are features like online renter payments, tenant portal (for payments and work orders), help keeping track of work orders, tax reporting features, and accounting functionality.

Honestly looking at your situation I'm not sure I would recommend you do the taxes yourself,  change of accounting method (F 3115) isn't easy for someone that hadn't done them before these online software companies make things seem easier than what they are, they are good for less complex situations. 

.- Creditworthiness: German banks assess your financial standing, so keeping accounts in good standing is critical.4.

I have totally given up on Quickbooks though it remains the best accounting software for the non CPA type 

*Again, this doesn't seem necessary on your current lot because you are allowed to build a 2-flat, by right, on RS3 land of that size.

Consolidation needs to cycle, with all infrastructure maturing to fully meet new size and facilitate continued growth.

There is well developed  case law that points to a guarantor having to receive a benefit in order for the lender to hold them accountable in the event of a default etc.

Upon verification, the Landlord will pay you $2,000 cash, and both parties will sign a receipt acknowledging that your account has been settled.